The RZI 1.25G BiDi SFP Module is designed for Gigabit Ethernet transmission over single mode single fiber. It uses BiDi wavelength division technology to transmit and receive optical signals through one SC simplex fiber connection, helping network engineers reduce fiber core usage while maintaining stable 1.25Gbps optical performance.

Unlike standard dual-fiber SFP modules that require two fiber cores, this Gigabit SFP SC Module uses a 1310nm/1550nm wavelength pair over one single mode fiber. It is supplied as a matched pair, making it suitable for point-to-point Gigabit fiber links where fiber resources are limited.

This 1.25G SFP Transceiver supports DDM monitoring for optical diagnostics and is suitable for switches, routers, fiber media converters, network firewalls, fiber optic network cards, servers, storage systems, ODF cabling, telecom rooms, security networks, campus networks, and building-to-building Ethernet links.

Compared with LC BiDi SFP modules, this SC version is especially useful for projects where the existing fiber distribution system uses SC connectors, such as optical distribution frames, weak-current cabinets, access equipment, and traditional telecom fiber cabling.

RZI provides compatibility options for major switch and router platforms, helping users deploy stable 1G single-fiber links across different network environments.

Features

• 1.25G BiDi SFP Module for Gigabit single-fiber transmission
• Supplied as a matched transceiver pair
• SC simplex interface for single fiber deployment
• 1310nm / 1550nm wavelength pair
• Supports up to 20km transmission over single mode fiber
• DDM digital diagnostic monitoring support
• 1.25Gbps optical transmission speed
• 3.3V SFP operating voltage
• Zinc-magnesium alloy housing for stable operation
• Suitable for Gigabit switches, routers, firewalls, servers, and media converters
• SC connector design for ODF, telecom room, access network, and weak-current cabinet deployment
• Compatible coding options for Cisco, Huawei, MikroTik, Ubiquiti, ZTE, HPE-Aruba, Juniper, Intel, TP-Link, H3C, and more
• Helps save fiber cores compared with dual-fiber SFP modules
• Factory tested by RZI for stable optical performance

Applications

• Gigabit Ethernet Fiber Links
• Single Fiber Network Deployment
• Switch-to-Switch Gigabit Uplink
• Router-to-Switch Fiber Connection
• Fiber Media Converter Deployment
• ODF Fiber Distribution Systems
• Telecom Room Fiber Access
• Security and IP Camera Networks
• Campus Fiber Networks
• Building-to-Building Ethernet Links
• Network Firewall Fiber Connection
• Server and Storage Fiber Connection
• Fiber Optic Network Card Connection
• Weak-Current Cabinet Installation

Specifications

Why Choose a 1.25G BiDi SFP Module?

A 1.25G BiDi SFP Module is useful when a network needs Gigabit fiber transmission but only one fiber core is available. Instead of using two separate fibers for transmit and receive, BiDi SFP modules use two different wavelengths over the same fiber.

This helps users:

• Save fiber core resources
• Upgrade existing single-fiber links
• Reduce cabling cost
• Simplify fiber deployment
• Extend Gigabit Ethernet over long distances
• Build stable point-to-point fiber connections

For building-to-building links, campus networks, security systems, ODF systems, telecom rooms, and media converter deployment, the RZI Single Fiber SFP Module provides a practical and cost-effective Gigabit optical solution.

How BiDi SFP Transmission Works

BiDi means bidirectional transmission. A BiDi SFP module transmits and receives optical signals over one fiber core by using two different wavelengths.

A typical 1.25G BiDi pair works like this:

| Side | Transmit Wavelength | Receive Wavelength |
|—|—|
| Side A | 1310nm | 1550nm |
| Side B | 1550nm | 1310nm |

Because of this wavelength pairing, BiDi SFP modules must be used in matched pairs. Two modules with the same wavelength direction will not create a normal link.

SC BiDi SFP vs LC BiDi SFP

Both SC and LC BiDi SFP modules can support single-fiber Gigabit transmission, but they are used in different cabling environments.

Choose the SC version when your existing fiber cabling, patch panel, or optical distribution frame uses SC connectors.

Choose the LC version when your equipment or patching system is based on LC interfaces.

1.25G BiDi SFP vs Standard Dual-Fiber SFP

| Module Type | Fiber Usage | Best For |
|—|—|
| Standard Dual-Fiber SFP | Uses two fiber cores | Normal Gigabit fiber links with enough fiber resources |
| 1.25G BiDi SFP Module | Uses one fiber core | Single fiber links and fiber-saving deployments |

Choose a BiDi SFP module when only one fiber core is available or when you want to reduce fiber usage.

Choose a standard dual-fiber SFP module when your fiber infrastructure already provides two available fiber cores.

Compatibility Notes

RZI can provide compatible coding for different switch, router, firewall, and media converter platforms. Before ordering, please confirm the device brand and model to ensure correct recognition and stable operation.

Common compatibility options include:

• Cisco
• Huawei
• MikroTik
• Ubiquiti
• ZTE
• HPE-Aruba
• Juniper
• Intel
• H3C
• TP-Link
• Arista
• Brocade
• Extreme
• Mellanox
• General coding

Important Pairing Notes

This 1.25G SFP Transceiver should be used with the correct opposite wavelength module. A 1310nm TX / 1550nm RX module should be paired with a 1550nm TX / 1310nm RX module.

Before deployment, confirm:

• The fiber type is single mode
• The connector type is SC
• The link distance is within the selected optical budget
• The two modules are matched A/B wavelength pairs
• The host device supports 1G SFP modules
• The compatibility coding matches the switch or router brand
• DDM monitoring is required or supported by the host device